code: def test_multi_alias_pushdown() -> None:
      lf = pl.LazyFrame({"a": [1], "b": [1]})
  
      actual = lf.with_columns(m="a", n="b").filter(
          (pl.col("m") + pl.col("n")) < 2
      )
  
      plan = actual.explain()
      assert "FILTER" not in plan
      assert (
          r'SELECTION: "[([(col(\"a\")) + (col(\"b\"))]) < (2)]' in plan
      )
  
imports: from datetime import date, datetime, timedelta
  from typing import Any
  import numpy
  import pytest
  import polars
  from polars.testing import assert_frame_equal
  from polars.testing.asserts.series import assert_series_equal
label_desc: Use image node_id 18 for calling a global function with example usage: test_multi_alias_pushdown() without return types